2 * linux/drivers/mmc/core/sd.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/err.h>
14 #include <linux/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/pm_runtime.h>
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/mmc/sd.h>
30 static const unsigned int tran_exp[] = {
31 10000, 100000, 1000000, 10000000,
35 static const unsigned char tran_mant[] = {
36 0, 10, 12, 13, 15, 20, 25, 30,
37 35, 40, 45, 50, 55, 60, 70, 80,
40 static const unsigned int tacc_exp[] = {
41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
44 static const unsigned int tacc_mant[] = {
45 0, 10, 12, 13, 15, 20, 25, 30,
46 35, 40, 45, 50, 55, 60, 70, 80,
49 static const unsigned int sd_au_size[] = {
50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
56 #define UNSTUFF_BITS(resp,start,size) \
58 const int __size = size; \
59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
60 const int __off = 3 - ((start) / 32); \
61 const int __shft = (start) & 31; \
64 __res = resp[__off] >> __shft; \
65 if (__size + __shft > 32) \
66 __res |= resp[__off-1] << ((32 - __shft) % 32); \
71 * Given the decoded CSD structure, decode the raw CID to our CID structure.
73 void mmc_decode_cid(struct mmc_card *card)
75 u32 *resp = card->raw_cid;
78 * SD doesn't currently have a version field so we will
79 * have to assume we can parse this.
81 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
82 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
83 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
84 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
85 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
86 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
87 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
88 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
89 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
90 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
91 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
92 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
94 card->cid.year += 2000; /* SD cards year offset */
98 * Given a 128-bit response, decode to our card CSD structure.
100 static int mmc_decode_csd(struct mmc_card *card)
102 struct mmc_csd *csd = &card->csd;
103 unsigned int e, m, csd_struct;
104 u32 *resp = card->raw_csd;
106 csd_struct = UNSTUFF_BITS(resp, 126, 2);
108 switch (csd_struct) {
110 m = UNSTUFF_BITS(resp, 115, 4);
111 e = UNSTUFF_BITS(resp, 112, 3);
112 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
113 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
115 m = UNSTUFF_BITS(resp, 99, 4);
116 e = UNSTUFF_BITS(resp, 96, 3);
117 csd->max_dtr = tran_exp[e] * tran_mant[m];
118 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
120 e = UNSTUFF_BITS(resp, 47, 3);
121 m = UNSTUFF_BITS(resp, 62, 12);
122 csd->capacity = (1 + m) << (e + 2);
124 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
125 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
126 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
127 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
128 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
129 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
130 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
131 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
133 if (UNSTUFF_BITS(resp, 46, 1)) {
135 } else if (csd->write_blkbits >= 9) {
136 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
137 csd->erase_size <<= csd->write_blkbits - 9;
140 if (UNSTUFF_BITS(resp, 13, 1))
141 mmc_card_set_readonly(card);
145 * This is a block-addressed SDHC or SDXC card. Most
146 * interesting fields are unused and have fixed
147 * values. To avoid getting tripped by buggy cards,
148 * we assume those fixed values ourselves.
150 mmc_card_set_blockaddr(card);
152 csd->tacc_ns = 0; /* Unused */
153 csd->tacc_clks = 0; /* Unused */
155 m = UNSTUFF_BITS(resp, 99, 4);
156 e = UNSTUFF_BITS(resp, 96, 3);
157 csd->max_dtr = tran_exp[e] * tran_mant[m];
158 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
159 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
161 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
162 if (csd->c_size >= 0xFFFF)
163 mmc_card_set_ext_capacity(card);
165 m = UNSTUFF_BITS(resp, 48, 22);
166 csd->capacity = (1 + m) << 10;
168 csd->read_blkbits = 9;
169 csd->read_partial = 0;
170 csd->write_misalign = 0;
171 csd->read_misalign = 0;
172 csd->r2w_factor = 4; /* Unused */
173 csd->write_blkbits = 9;
174 csd->write_partial = 0;
177 if (UNSTUFF_BITS(resp, 13, 1))
178 mmc_card_set_readonly(card);
181 pr_err("%s: unrecognised CSD structure version %d\n",
182 mmc_hostname(card->host), csd_struct);
186 card->erase_size = csd->erase_size;
192 * Given a 64-bit response, decode to our card SCR structure.
194 static int mmc_decode_scr(struct mmc_card *card)
196 struct sd_scr *scr = &card->scr;
197 unsigned int scr_struct;
200 resp[3] = card->raw_scr[1];
201 resp[2] = card->raw_scr[0];
203 scr_struct = UNSTUFF_BITS(resp, 60, 4);
204 if (scr_struct != 0) {
205 pr_err("%s: unrecognised SCR structure version %d\n",
206 mmc_hostname(card->host), scr_struct);
210 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
211 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
212 if (scr->sda_vsn == SCR_SPEC_VER_2)
213 /* Check if Physical Layer Spec v3.0 is supported */
214 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
216 if (UNSTUFF_BITS(resp, 55, 1))
217 card->erased_byte = 0xFF;
219 card->erased_byte = 0x0;
222 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
224 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
225 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
226 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
227 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
235 * Fetch and process SD Status register.
237 static int mmc_read_ssr(struct mmc_card *card)
239 unsigned int au, es, et, eo;
243 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
244 pr_warn("%s: card lacks mandatory SD Status function\n",
245 mmc_hostname(card->host));
249 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
253 if (mmc_app_sd_status(card, raw_ssr)) {
254 pr_warn("%s: problem reading SD Status register\n",
255 mmc_hostname(card->host));
260 for (i = 0; i < 16; i++)
261 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
266 * UNSTUFF_BITS only works with four u32s so we have to offset the
267 * bitfield positions accordingly.
269 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
271 if (au <= 9 || card->scr.sda_spec3) {
272 card->ssr.au = sd_au_size[au];
273 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
274 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
276 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
277 card->ssr.erase_timeout = (et * 1000) / es;
278 card->ssr.erase_offset = eo * 1000;
281 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
282 mmc_hostname(card->host));
290 * Fetches and decodes switch information
292 static int mmc_read_switch(struct mmc_card *card)
297 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
300 if (!(card->csd.cmdclass & CCC_SWITCH)) {
301 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
302 mmc_hostname(card->host));
308 status = kmalloc(64, GFP_KERNEL);
310 pr_err("%s: could not allocate a buffer for "
311 "switch capabilities.\n",
312 mmc_hostname(card->host));
317 * Find out the card's support bits with a mode 0 operation.
318 * The argument does not matter, as the support bits do not
319 * change with the arguments.
321 err = mmc_sd_switch(card, 0, 0, 0, status);
324 * If the host or the card can't do the switch,
325 * fail more gracefully.
327 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
330 pr_warn("%s: problem reading Bus Speed modes\n",
331 mmc_hostname(card->host));
337 if (status[13] & SD_MODE_HIGH_SPEED)
338 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
340 if (card->scr.sda_spec3) {
341 card->sw_caps.sd3_bus_mode = status[13];
342 /* Driver Strengths supported by the card */
343 card->sw_caps.sd3_drv_type = status[9];
344 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
354 * Test if the card supports high-speed mode and, if so, switch to it.
356 int mmc_sd_switch_hs(struct mmc_card *card)
361 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
364 if (!(card->csd.cmdclass & CCC_SWITCH))
367 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
370 if (card->sw_caps.hs_max_dtr == 0)
373 status = kmalloc(64, GFP_KERNEL);
375 pr_err("%s: could not allocate a buffer for "
376 "switch capabilities.\n", mmc_hostname(card->host));
380 err = mmc_sd_switch(card, 1, 0, 1, status);
384 if ((status[16] & 0xF) != 1) {
385 pr_warn("%s: Problem switching card into high-speed mode!\n",
386 mmc_hostname(card->host));
398 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
400 int card_drv_type, drive_strength, drv_type;
403 card->drive_strength = 0;
405 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
407 drive_strength = mmc_select_drive_strength(card,
408 card->sw_caps.uhs_max_dtr,
409 card_drv_type, &drv_type);
411 if (drive_strength) {
412 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
415 if ((status[15] & 0xF) != drive_strength) {
416 pr_warn("%s: Problem setting drive strength!\n",
417 mmc_hostname(card->host));
420 card->drive_strength = drive_strength;
424 mmc_set_driver_type(card->host, drv_type);
429 static void sd_update_bus_speed_mode(struct mmc_card *card)
432 * If the host doesn't support any of the UHS-I modes, fallback on
435 if (!mmc_host_uhs(card->host)) {
436 card->sd_bus_speed = 0;
440 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
441 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
442 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
443 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
444 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
445 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
446 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
447 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
448 SD_MODE_UHS_SDR50)) {
449 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
450 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
451 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
452 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
453 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
454 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
455 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
456 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
457 SD_MODE_UHS_SDR12)) {
458 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
462 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
465 unsigned int timing = 0;
467 switch (card->sd_bus_speed) {
468 case UHS_SDR104_BUS_SPEED:
469 timing = MMC_TIMING_UHS_SDR104;
470 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
472 case UHS_DDR50_BUS_SPEED:
473 timing = MMC_TIMING_UHS_DDR50;
474 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
476 case UHS_SDR50_BUS_SPEED:
477 timing = MMC_TIMING_UHS_SDR50;
478 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
480 case UHS_SDR25_BUS_SPEED:
481 timing = MMC_TIMING_UHS_SDR25;
482 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
484 case UHS_SDR12_BUS_SPEED:
485 timing = MMC_TIMING_UHS_SDR12;
486 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
492 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
496 if ((status[16] & 0xF) != card->sd_bus_speed)
497 pr_warn("%s: Problem setting bus speed mode!\n",
498 mmc_hostname(card->host));
500 mmc_set_timing(card->host, timing);
501 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
507 /* Get host's max current setting at its current voltage */
508 static u32 sd_get_host_max_current(struct mmc_host *host)
510 u32 voltage, max_current;
512 voltage = 1 << host->ios.vdd;
514 case MMC_VDD_165_195:
515 max_current = host->max_current_180;
519 max_current = host->max_current_300;
523 max_current = host->max_current_330;
532 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
534 int current_limit = SD_SET_CURRENT_NO_CHANGE;
539 * Current limit switch is only defined for SDR50, SDR104, and DDR50
540 * bus speed modes. For other bus speed modes, we do not change the
543 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
544 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
545 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
549 * Host has different current capabilities when operating at
550 * different voltages, so find out its max current first.
552 max_current = sd_get_host_max_current(card->host);
555 * We only check host's capability here, if we set a limit that is
556 * higher than the card's maximum current, the card will be using its
557 * maximum current, e.g. if the card's maximum current is 300ma, and
558 * when we set current limit to 200ma, the card will draw 200ma, and
559 * when we set current limit to 400/600/800ma, the card will draw its
560 * maximum 300ma from the host.
562 * The above is incorrect: if we try to set a current limit that is
563 * not supported by the card, the card can rightfully error out the
564 * attempt, and remain at the default current limit. This results
565 * in a 300mA card being limited to 200mA even though the host
566 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
567 * an iMX6 host. --rmk
569 if (max_current >= 800 &&
570 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
571 current_limit = SD_SET_CURRENT_LIMIT_800;
572 else if (max_current >= 600 &&
573 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
574 current_limit = SD_SET_CURRENT_LIMIT_600;
575 else if (max_current >= 400 &&
576 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
577 current_limit = SD_SET_CURRENT_LIMIT_400;
578 else if (max_current >= 200 &&
579 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
580 current_limit = SD_SET_CURRENT_LIMIT_200;
582 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
583 err = mmc_sd_switch(card, 1, 3, current_limit, status);
587 if (((status[15] >> 4) & 0x0F) != current_limit)
588 pr_warn("%s: Problem setting current limit!\n",
589 mmc_hostname(card->host));
597 * UHS-I specific initialization procedure
599 static int mmc_sd_init_uhs_card(struct mmc_card *card)
604 if (!card->scr.sda_spec3)
607 if (!(card->csd.cmdclass & CCC_SWITCH))
610 status = kmalloc(64, GFP_KERNEL);
612 pr_err("%s: could not allocate a buffer for "
613 "switch capabilities.\n", mmc_hostname(card->host));
617 /* Set 4-bit bus width */
618 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
619 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
620 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
624 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
628 * Select the bus speed mode depending on host
629 * and card capability.
631 sd_update_bus_speed_mode(card);
633 /* Set the driver strength for the card */
634 err = sd_select_driver_type(card, status);
638 /* Set current limit for the card */
639 err = sd_set_current_limit(card, status);
643 /* Set bus speed mode of the card */
644 err = sd_set_bus_speed_mode(card, status);
649 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
650 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
652 if (!mmc_host_is_spi(card->host) &&
653 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
654 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
655 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
656 err = mmc_execute_tuning(card);
659 * As SD Specifications Part1 Physical Layer Specification
660 * Version 3.01 says, CMD19 tuning is available for unlocked
661 * cards in transfer state of 1.8V signaling mode. The small
662 * difference between v3.00 and 3.01 spec means that CMD19
663 * tuning is also available for DDR50 mode.
665 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
666 pr_warn("%s: ddr50 tuning failed\n",
667 mmc_hostname(card->host));
678 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
679 card->raw_cid[2], card->raw_cid[3]);
680 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
681 card->raw_csd[2], card->raw_csd[3]);
682 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
684 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
685 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
686 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
687 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
688 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
689 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
691 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
692 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
693 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
694 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
695 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
696 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
697 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
698 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
699 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
700 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
703 static ssize_t mmc_dsr_show(struct device *dev,
704 struct device_attribute *attr,
707 struct mmc_card *card = mmc_dev_to_card(dev);
708 struct mmc_host *host = card->host;
710 if (card->csd.dsr_imp && host->dsr_req)
711 return sprintf(buf, "0x%x\n", host->dsr);
713 /* return default DSR value */
714 return sprintf(buf, "0x%x\n", 0x404);
717 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
719 static struct attribute *sd_std_attrs[] = {
725 &dev_attr_erase_size.attr,
726 &dev_attr_preferred_erase_size.attr,
727 &dev_attr_fwrev.attr,
728 &dev_attr_hwrev.attr,
729 &dev_attr_manfid.attr,
731 &dev_attr_oemid.attr,
732 &dev_attr_serial.attr,
737 ATTRIBUTE_GROUPS(sd_std);
739 struct device_type sd_type = {
740 .groups = sd_std_groups,
744 * Fetch CID from card.
746 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
756 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
760 * Since we're changing the OCR value, we seem to
761 * need to tell some cards to go back to the idle
762 * state. We wait 1ms to give cards time to
768 * If SD_SEND_IF_COND indicates an SD 2.0
769 * compliant card and we should set bit 30
770 * of the ocr to indicate that we can handle
771 * block-addressed SDHC cards.
773 err = mmc_send_if_cond(host, ocr);
778 * If the host supports one of UHS-I modes, request the card
779 * to switch to 1.8V signaling level. If the card has failed
780 * repeatedly to switch however, skip this.
782 if (retries && mmc_host_uhs(host))
786 * If the host can supply more than 150mA at current voltage,
787 * XPC should be set to 1.
789 max_current = sd_get_host_max_current(host);
790 if (max_current > 150)
793 err = mmc_send_app_op_cond(host, ocr, rocr);
798 * In case CCS and S18A in the response is set, start Signal Voltage
799 * Switch procedure. SPI mode doesn't support CMD11.
801 if (!mmc_host_is_spi(host) && rocr &&
802 ((*rocr & 0x41000000) == 0x41000000)) {
803 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
805 if (err == -EAGAIN) {
814 if (mmc_host_is_spi(host))
815 err = mmc_send_cid(host, cid);
817 err = mmc_all_send_cid(host, cid);
822 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
827 * Fetch CSD from card.
829 err = mmc_send_csd(card, card->raw_csd);
833 err = mmc_decode_csd(card);
840 static int mmc_sd_get_ro(struct mmc_host *host)
845 * Some systems don't feature a write-protect pin and don't need one.
846 * E.g. because they only have micro-SD card slot. For those systems
847 * assume that the SD card is always read-write.
849 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
852 if (!host->ops->get_ro)
855 ro = host->ops->get_ro(host);
860 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
867 * Fetch SCR from card.
869 err = mmc_app_send_scr(card, card->raw_scr);
873 err = mmc_decode_scr(card);
878 * Fetch and process SD Status register.
880 err = mmc_read_ssr(card);
884 /* Erase init depends on CSD and SSR */
885 mmc_init_erase(card);
888 * Fetch switch information from card.
890 err = mmc_read_switch(card);
896 * For SPI, enable CRC as appropriate.
897 * This CRC enable is located AFTER the reading of the
898 * card registers because some SDHC cards are not able
899 * to provide valid CRCs for non-512-byte blocks.
901 if (mmc_host_is_spi(host)) {
902 err = mmc_spi_set_crc(host, use_spi_crc);
908 * Check if read-only switch is active.
911 int ro = mmc_sd_get_ro(host);
914 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
917 mmc_card_set_readonly(card);
924 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
926 unsigned max_dtr = (unsigned int)-1;
928 if (mmc_card_hs(card)) {
929 if (max_dtr > card->sw_caps.hs_max_dtr)
930 max_dtr = card->sw_caps.hs_max_dtr;
931 } else if (max_dtr > card->csd.max_dtr) {
932 max_dtr = card->csd.max_dtr;
939 * Handle the detection and initialisation of a card.
941 * In the case of a resume, "oldcard" will contain the card
942 * we're trying to reinitialise.
944 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
945 struct mmc_card *oldcard)
947 struct mmc_card *card;
953 WARN_ON(!host->claimed);
955 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
960 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
966 * Allocate card structure.
968 card = mmc_alloc_card(host, &sd_type);
970 return PTR_ERR(card);
973 card->type = MMC_TYPE_SD;
974 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
978 * Call the optional HC's init_card function to handle quirks.
980 if (host->ops->init_card)
981 host->ops->init_card(host, card);
984 * For native busses: get card RCA and quit open drain mode.
986 if (!mmc_host_is_spi(host)) {
987 err = mmc_send_relative_addr(host, &card->rca);
993 err = mmc_sd_get_csd(host, card);
997 mmc_decode_cid(card);
1001 * handling only for cards supporting DSR and hosts requesting
1004 if (card->csd.dsr_imp && host->dsr_req)
1008 * Select card, as all following commands rely on that.
1010 if (!mmc_host_is_spi(host)) {
1011 err = mmc_select_card(card);
1016 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1020 /* Initialization sequence for UHS-I cards */
1021 if (rocr & SD_ROCR_S18A) {
1022 err = mmc_sd_init_uhs_card(card);
1027 * Attempt to change to high-speed (if supported)
1029 err = mmc_sd_switch_hs(card);
1031 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1038 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1041 * Switch to wider bus (if supported).
1043 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1044 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1045 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1049 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1058 mmc_remove_card(card);
1064 * Host is being removed. Free up the current card.
1066 static void mmc_sd_remove(struct mmc_host *host)
1069 BUG_ON(!host->card);
1071 mmc_remove_card(host->card);
1076 * Card detection - card is alive.
1078 static int mmc_sd_alive(struct mmc_host *host)
1080 return mmc_send_status(host->card, NULL);
1084 * Card detection callback from host.
1086 static void mmc_sd_detect(struct mmc_host *host)
1091 BUG_ON(!host->card);
1093 mmc_get_card(host->card);
1096 * Just check if our card has been removed.
1098 err = _mmc_detect_card_removed(host);
1100 mmc_put_card(host->card);
1103 mmc_sd_remove(host);
1105 mmc_claim_host(host);
1106 mmc_detach_bus(host);
1107 mmc_power_off(host);
1108 mmc_release_host(host);
1112 static int _mmc_sd_suspend(struct mmc_host *host)
1117 BUG_ON(!host->card);
1119 mmc_claim_host(host);
1121 if (mmc_card_suspended(host->card))
1124 if (!mmc_host_is_spi(host))
1125 err = mmc_deselect_cards(host);
1128 mmc_power_off(host);
1129 mmc_card_set_suspended(host->card);
1133 mmc_release_host(host);
1138 * Callback for suspend
1140 static int mmc_sd_suspend(struct mmc_host *host)
1144 err = _mmc_sd_suspend(host);
1146 pm_runtime_disable(&host->card->dev);
1147 pm_runtime_set_suspended(&host->card->dev);
1154 * This function tries to determine if the same card is still present
1155 * and, if so, restore all state to it.
1157 static int _mmc_sd_resume(struct mmc_host *host)
1162 BUG_ON(!host->card);
1164 mmc_claim_host(host);
1166 if (!mmc_card_suspended(host->card))
1169 mmc_power_up(host, host->card->ocr);
1170 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1171 mmc_card_clr_suspended(host->card);
1174 mmc_release_host(host);
1179 * Callback for resume
1181 static int mmc_sd_resume(struct mmc_host *host)
1183 pm_runtime_enable(&host->card->dev);
1188 * Callback for runtime_suspend.
1190 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1194 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1197 err = _mmc_sd_suspend(host);
1199 pr_err("%s: error %d doing aggressive suspend\n",
1200 mmc_hostname(host), err);
1206 * Callback for runtime_resume.
1208 static int mmc_sd_runtime_resume(struct mmc_host *host)
1212 err = _mmc_sd_resume(host);
1213 if (err && err != -ENOMEDIUM)
1214 pr_err("%s: error %d doing runtime resume\n",
1215 mmc_hostname(host), err);
1220 static int mmc_sd_reset(struct mmc_host *host)
1222 mmc_power_cycle(host, host->card->ocr);
1223 return mmc_sd_init_card(host, host->card->ocr, host->card);
1226 static const struct mmc_bus_ops mmc_sd_ops = {
1227 .remove = mmc_sd_remove,
1228 .detect = mmc_sd_detect,
1229 .runtime_suspend = mmc_sd_runtime_suspend,
1230 .runtime_resume = mmc_sd_runtime_resume,
1231 .suspend = mmc_sd_suspend,
1232 .resume = mmc_sd_resume,
1233 .alive = mmc_sd_alive,
1234 .shutdown = mmc_sd_suspend,
1235 .reset = mmc_sd_reset,
1239 * Starting point for SD card init.
1241 int mmc_attach_sd(struct mmc_host *host)
1247 WARN_ON(!host->claimed);
1249 err = mmc_send_app_op_cond(host, 0, &ocr);
1253 mmc_attach_bus(host, &mmc_sd_ops);
1254 if (host->ocr_avail_sd)
1255 host->ocr_avail = host->ocr_avail_sd;
1258 * We need to get OCR a different way for SPI.
1260 if (mmc_host_is_spi(host)) {
1263 err = mmc_spi_read_ocr(host, 0, &ocr);
1269 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1270 * these bits as being in-valid and especially also bit7.
1274 rocr = mmc_select_voltage(host, ocr);
1277 * Can we support the voltage(s) of the card(s)?
1285 * Detect and init the card.
1287 err = mmc_sd_init_card(host, rocr, NULL);
1291 mmc_release_host(host);
1292 err = mmc_add_card(host->card);
1296 mmc_claim_host(host);
1300 mmc_remove_card(host->card);
1302 mmc_claim_host(host);
1304 mmc_detach_bus(host);
1306 pr_err("%s: error %d whilst initialising SD card\n",
1307 mmc_hostname(host), err);